Misconduct by authorised courier can render them unfit to transact customs business based on the commissioner's opinion. Amendment substitutes clause (c) of regulation 14(1) to provide that misconduct by an Authorised Courier, whether within the Commissioner's jurisdiction or elsewhere, which in the Commissioner's opinion renders the courier unfit to transact any business in the Customs Station, constitutes grounds for action; the Third Amendment Regulations take effect on publication in the Official Gazette and are made under the statutory authority of the Central Board of Excise and Customs.